Prevent updater downloads from hanging indefinitely

[Copilot]

GitHub release downloads could stall indefinitely while fetching the USBip asset, leaving the updater stuck without feedback.

• Bounded streaming: Apply a 30-second timeout to each response-body read.
• Failure handling: Timed-out transfers flow through the existing failed-download state.

while ((read = await sourceStream
    .ReadAsync(buffer, 0, buffer.Length)
    .WaitAsync(DownloadReadTimeout)) > 0)
{
    // write and report progress
}

• Fixes update to 1.2.1.1: download stalled? #1475

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